[Python] Python how to get ordered set with the same API as regular set?

(1) sets in python are not ordered but (2), in modern Python a good way to get an ordered set is to use a dictionary (which now preservers key/value insertion order) with None values. Are there ordered sets which have the same API as a regular set? For example:

color_set = set()
color_set.add('red')
color_set.add('blue')
color_set.add('red')
color_set.add('yellow')



color_set = dict()
color_set['red'] = None
color_set['blue'] = None
color_set['red'] = None
color_set['yellow'] = None


The syntax is different. I could do:

class OrderedSet(dict):
def add(self, value)
self[value] = None


If there are other features of set that I would like, must I maintain a OrderedSet class? Is there a simple way to realize OrderedSet with the same API as set?

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